Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -2996,14 +2996,18 @@
     return true;
   }
   if (Left.is(TT_UnaryOperator)) {
-    // The alternative operators for ~ and ! are "compl" and "not".
-    // If they are used instead, we do not want to combine them with
-    // the token to the right, unless that is a left paren.
     if (!Right.is(tok::l_paren)) {
+      // The alternative operators for ~ and ! are "compl" and "not".
+      // If they are used instead, we do not want to combine them with
+      // the token to the right, unless that is a left paren.
       if (Left.is(tok::exclaim) && Left.TokenText == "not")
         return true;
       if (Left.is(tok::tilde) && Left.TokenText == "compl")
         return true;
+      // Lambda captures allow for a lone &, so "&]" needs to be properly
+      // handled.
+      if (Left.is(tok::amp) && Right.is(tok::r_square))
+        return Style.SpacesInSquareBrackets;
     }
     return (Style.SpaceAfterLogicalNot && Left.is(tok::exclaim)) ||
            Right.is(TT_BinaryOperator);
Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -10638,6 +10638,7 @@
   verifyFormat("return [ i, args... ] {};", Spaces);
   verifyFormat("int foo = [ &bar ]() {};", Spaces);
   verifyFormat("int foo = [ = ]() {};", Spaces);
+  verifyFormat("int foo = [ & ]() {};", Spaces);
   verifyFormat("int foo = [ =, &bar ]() {};", Spaces);
   verifyFormat("int foo = [ &bar, = ]() {};", Spaces);
 }